UltraBoard Classic™ consists of a polystyrene foam core board between two rigid sheets of polystyrene. UltraBoard Classic™ foam core boards, a popular choice for interior permanent displays and signs. UltraBoard Classic™ is both warp and moisture resistant. Cut with circular saw, router, i-Cut, scroll saw, hand-cut and die-cut. Ideal for screen printing, digital printing, painting, photo mounting, vinyl application, signage, POP displays and routed letters.